ADD file via upload

src/User.java

@@ -0,0 +1,73 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.io.IOException;
+
+public class User {
+  String username;
+  String password;
+  String level;
+  ArrayList<User> list1 = new ArrayList<>();
+  int state = 1;
+
+  public boolean logon() { //登录
+    if (state == 1) {
+      try {
+        new ProcessBuilder("clear").inheritIO().start().waitFor();
+      } catch (IOException | InterruptedException e) {
+        //e.printStackTrace();
+      }
+      //            try {
+      //                Runtime.getRuntime().exec("cmd /c cls").waitFor();
+      //            } catch (IOException | InterruptedException e) {
+      //                e.printStackTrace();
+      //            }
+      System.out.println("=== 中小学数学卷子自动生成程序 ===");
+      System.out.println("请输入账户名称，密码:");
+    }
+    Scanner sc = new Scanner(System.in);
+    String name = sc.next();
+    String word = sc.next();
+    for (int i = 0; i < list1.size(); i++) {
+      if (name.equals(list1.get(i).username) && word.equals(list1.get(i).password)) {
+        username = name;
+        password = word;
+        level = list1.get(i).level;
+        state = 1;
+        return true;
+      }
+    }
+    System.out.println("请输入正确的用户名、密码");
+    state = 0;
+    return true;
+  }
+
+  public void start() {
+    initializeUser();
+    while (logon()) {
+      if (state == 0) {
+        continue;
+      } else if (state == 1) {
+        problem p1 = new problem();
+        p1.start(this);
+      }
+    }
+  }
+
+  public User(String username, String password, String level) {
+    this.username = username;
+    this.password = password;
+    this.level = level;
+  }
+
+  private void initializeUser() {
+    list1.add(new User("张三1", "123", "小学"));
+    list1.add(new User("张三2", "123", "小学"));
+    list1.add(new User("张三3", "123", "小学"));
+    list1.add(new User("李四1", "123", "初中"));
+    list1.add(new User("李四2", "123", "初中"));
+    list1.add(new User("李四3", "123", "初中"));
+    list1.add(new User("王五1", "123", "高中"));
+    list1.add(new User("王五2", "123", "高中"));
+    list1.add(new User("王五3", "123", "高中"));
+  }
+}